Preliminary experimentation demonstrates that although a system that allows for context specific spontaneity is likely to improve the acquisition of user relevance feedback, this is by no means a solution. We believe that the
problems associated with a lack of willingness to modify queries or to provide
relevance feedback within the Web environment, are indicative of a high state
of cognitive load. A number of task and cognitive variables exist and need to
be identified before a model of cognitive load for IR can be developed.

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This article was published in the electronic journal, Information Research, available at: http://informationr.net/ir/index.html.